Kinetics of manganese ion adsorption on kaolinite
Abstract
One of the most important tasks of our time is the problem of pollution of natural waters with heavy metals, which have toxic properties and pose a danger to the environment. The choice of the optimal type of water treatment is based on parameters such as the concentration of ions in the water and the cost of treatment. The adsorption extraction method is widely used to remove many heavy metal ions, having a number of advantages such as simplicity, speed, and relatively low costs. Synthetic sorbents and natural sorbents are used as sorbents. The advantage of the latter is low cost and accessibility. From an economic point of view, preference is given to inexpensive sorbents. Such a promising sorbent is kaolinite, which belongs to aluminosilicate minerals. Modification of aluminosilicate minerals improves sorption properties with respect to heavy metal ions.
Natural and modified kaolinite was selected as the object of research for the sorption of Mn2+ ions. The regularities of the kinetics of the sorption of manganese ions on various forms of kaolinite from a model solution are investigated. The sorption capacity was determined under static conditions at a temperature of 298 K. The experiments were carried out on model aqueous solutions prepared from MnSO4·4H2O manganese sulfate. The content of manganese ions in solutions varied from 1.0 to 9.0 mg/l. The kinetics of sorption has been studied by the time of establishing the chemical equilibrium of the sorption of Mn2+ ions. In all cases, equilibrium concentrations are reached within 40 minutes. During sorption purification of water bodies, an important technological parameter is the rate of extraction of metal ions. Kinetic parameters were calculated on the basis of kinetic sorption curves obtained in the temperature range of 298 – 333 K, velocity constants and diffusion coefficients.
The structure of natural kaolinite was studied by X-ray diffraction and X-ray phase analyses. It was found that with an increase in the concentration of manganese ions from 1.0 to 50.0 mg/l in solution, the sorption capacity increases. The exchange capacity of the modified forms increases significantly from 1.0 to 50.0 mg/g. This confirms that modified kaolinite is a selective sorbent for the extraction of manganese ions from aqueous solutions. The results obtained allow us to conclude that on the aluminosilicate sorbent kaolinite, the ion sorption process occurs by an ion exchange mechanism.
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